Telephone system



|.I.}|.....I|u III HQ l-IIuI-Illnl-IIII llllnlnlllll'll QIIII R. TRECHCINSKI TELEPHONE SYSTEM Filed April 28, 1928 Oct. 28, 1930.

`Patented OctyZrS, 1930 Y ii "narran STATES rATENroFFICE f ROMAN rREoHcINsKI, or wnnsaw, PoLANn, nssrenonr'ro TELEFON'AKTIEBOLAGET L. M. nnosson, orsTooKHoLM, SWEDEN, AooMrnNY or SWEDEN j "f TELEPHONE SYSTEM 1 Appucaatn inea prix 2s, was, semi No. 273348, and in 'sweaengatrnaa i927.

A In telephone plants comprising automatic telephone exchanges of different systems the Vinter-oiice traffic has hitherto usually been handled by means of operators which receive l; all, incoming traiiic from other exchanges and i` completethe connections either purely manu` vallyorin a semi-automatic way using the automatic switches of theyexchange'. A,The expression,. exchanges' of different systems, is lghere particularly `used to denote exchanges having subscribers lines or junction lines respectivelygrouped in accordance with di'er- 'ent numerical systems, whereas the design ofthe automatic exchanges as regards construc-` V,1 5, tive eaturesmayotherwise be similar or different. The present inventionhas for its object to provide for a direct automatic inter o'ice traHc between such exchanges of different systems. Princlpally, the invention .29. consists. thereinthattheestablishment of the telephone connections between exchanges .oit-v ditferent systems is eiiected under the control ofa register which is common to all selectors included, inthe talking connection and which .25. is arranged to control the setting of the se-V lectors during different stages of the switching operationin accordance with `different nu- Y merical systems lcorresponding' to the systems of the 'different exchanges included inthe 3.0. talking connection. j

i The invention will be more closely described with reference to theaccompanying drawing, which shows an lapplication of the invention for inter-oilice working between a,

telephone exchange having machinesdriven selectors adapted to be setby means of revertivelor back impulses under the-'control ofregisters, onthe one hand, andan exchange having electro-'magnetically driven selectors 4i-L adapted to be set by means of forwardlydirected impulses, on the other hand. In thedrawing only'those parts of the talking con- -nection and the appertaining switching apparatus are shown which are required for the 4s?n explanationof the invention. A calling sub-V scribers line AL will receivein known manner connection with a rst group selector 'GVl through a call finder AS andv the appertainn ing junction. line BL. Allotted to a group of 59, suchjunction lines are a number of registers means of` ajunction findenRS upon-.a cally vOccurrlng. In4 the example shown it is as# ling the setting of the selectors inaccordance consisting. of* a number ofv :register switches A BEL-REE, and a'number of control switches REG-REQ. Such, a i register is automaticallyA connected upto thejunctonline BL by s umed that -the group selector GV1can be used both for local connections Vwithin the same station, endl-for connections. throughYV other stations; The outgoing traffic to tele-v phone exchanges where the selectors are set by means of Aforward impulses is ycarried over junction lines CL. Allottedto eachof the. junction lines lastmentionedis an impulseY sending device' consisting ofl a number of re. lays-FR, GR,HR, IR, KR and LR, which are automatically brought inl operation when f the junctionline, is .taken intoengagement. Said. relays will then send current impulses simultaneouslyy rearwardlyl to theregister and 7.0v` forwardly to the selectors at the otherexchange. Saidl impulse sending device may be arranged at the outgoing or `at the incoming end of the junction line. f It may, evidently, be replaced bya switch driven electr-omag` netically' or otherwise. '1 f f l f The register switches RE are of thev kind which'are moved Yf'nrward for one-.step when theappertaining operatingfmagnet is ener# giZed and for another step when the magnet isde-energized. 1 They are provided-with rows of'lixed contacts A, B, Cetc. so arranged that opposite-contactsof each settingposiftion will befelec'trically connected by the, contact armsy (n'otrl shown) whichjare alrrangi'ed to move from the left to the right. Byfm'eans of la shifting device'consi'stingof a relay. UR the contacts of :the register,` switches mayrbe switched over or control 90 withfdifferent numerical" systems.A Y Certainv rowso/contacts,viz.=the rows B, D, Gr, L, P andl It` are adapted tocomey into use onlyy when extending-the talking connection to an exhange of another system, whereas the 95 rowsl of contacts A, C, F, H, I,.K,;M, O, Q, i will `corne lintouse only in establishing connections .in accordance with the numerical system of the own exchange. The rows of contacts E andN are used in both cases. The 100 Iregister switch REl comprises the contact row A, the register switch RE2 the contact rows B and C,'the register switch RE3 the contact rows D,'E, F, the register switch REdi the contact rows G, I-I and I5 and the register 4switch REY5 the contactrows K and L.

` 'Ihe contact rowsO and Pbelong tothe control switch RES and the contact rows Q-and R belongto .the controlswitch REQ. The

register switches RE1 to RE5k have ten'posif tions and are set in accordance with the decimal system. The control switches I tfll;7

and RES have positions corresponding to the groupingof'thellines Vin 25 group-s 'according to the 25 rows of contacts of the group selectors and the fina-l selector.V The,

control switch REQhas twenty v'positions cor,-`

responding to theV number of lines eachV v Contact row of the final selector. vrInstead of providing the dierent register switches with different series ofy cont-acts suitedfor different numerical systems, it is 'evidently also. possible toA 'use 'different registers which fare brought into operation Yalternately under the bereclfrom 40.000.toy`59l999.V In accordance herewith theshifting device UR iso eratedV over ,contacts Khlg in the fourthand fifth Sheva) control theshifting device j In the exainplefshown it maybe assumed the selectors at the first exchangehave.

a capacity of 500`lines., divided,into 25 numeif` c ical groups of`2`0 lines in .eachlgrou vivhele- 3'0v asthe'sel'ectors at the other exchange are assumed to have a'capacity of lOOlines divided .into 10 numerical groupsoflOlines in each slOuilA At the @Xchange lastfmenfoned the they 'decimalfsystemg Itmay'be assumed that the first .fstationcomprises 301000 subscribers numberedfrcm 10.000 Jt'o-39-999 and that the ;v

other exchangeihas'20-000. subscribers numpositionsof 'switch`RE1- The :20 first numerical line groups of the group selector Gr'Vluare, reserved for the ltraffic tothe exchange last mentioned, thedifierent numerical groups corresponding ito ldifferent thousands ofthe exchangelast mentioned. 'The junction lines extending to this exchange T are connected., to -second group; selectors (not :adapted `for the'selectingv of the hun! ClrflS.-;"` o s The successive switching inand out of' the different 'register lswitches is controlled 1nv known manner by meansoitfsequence switches Vas " SORl aiidSORg which are so constructed as topassto the'next contactposition only'upon the "appertaining coupling magnetlbeing del` energized. l The sequence switch SOR2 has` 4two contactarms AK and BK.

The operationis as follows. j After the calling subscriberv has 'been connected in known manner with a'disengaged junction line BL, through the call finder AS and to V a. disengaged register through the-junction finder RS,"the line circuit l is closed lthrough `be5678. The-register switch 'REl is oper atedoveif thecircuit 3 which is'closed when the impulse relay AR de-energizes a slowacting relay CR then receiving current over a circuit 4 and closing a circuit 5 for the seluence switch magllt ,SORi- 'hen after the sending of the first impulse series the impulse relay AR remains de-yenergized, the

relay CRV will release itsy armature causing the magnet SORltol cle-energize and to move:

the sequence switch Ainto the second position in which the register switch RE2 is connected 'up yforfreceiving the second impulse; series."

rIhis switch-as well astheremaining register switches `willA then be`- set similarlyasf just described. Immediately after the setting of' j the second' register switch REZ the group; se-v lector @LV1k was started in 'a manner which iieedviiotgbe more closely described.v Duringl itsA- movement the -group selector will send by means of7 an impulse ysender IS current im,- p'ulsesthrough ai circuit 6 including an impulse rela-y whichthen in turn sends im, pulses throughr the control switch REG over t'heci'rcuit. When theswitch last-men, tioned'reaches. the position which has, been marked by the setting of the register switches RE1 andRE-g, acircuit 8 is closed through contacts V'of said switches, .the Contact Iarm BK of the sequence switch SOR'2 and a relay ER. The relay last mentioned will then close afcircuit 9 over'ajcontactof a sequence switchy MRR and through the sequence switch mag'h net SORg the contactarme AK and BK' of the sequence switch being then moved 'forward for halfa step. The circuit 8 is then openedwand as a consequencealsothe circuitV 9 is opened the arms AK and BK being then moved. forward for another half step to thei next 'j position. .The group 'selector 'GVA'- is now started .in known manner to search for' a i i disengaged junction line injthe group thus selected." Vl/Yhenfinding a disengaged junction `line the Voircuitl() is closed through a Sequejnfswacii sos, the third wir@ of. the,

junction lin'eCL anda relay FR vwhichvn'ow energizes and closes a circuit 11 forthe send'- ing of forward impulses to the selectors located atthe other exchange. The impulse sending over. said circuits is effected by means of a relay IR the circuit '18. of' which is closed through a relay KR which now receives current over a circuit 12,.l The circuit 13, however, contains a slow-actingrelay in series with the relay IR and as consequence, therelay last mentioned, will roth@ ableftc:

attract its armature at once. The relayGR,

reggae c short-circuiting thereof the relay HR being then de-energized so as to remove said shortcircuiting. The current through .the impulse relay IR is then again reduced so as to cause the latter to release its armature and to close a line circuit 11 whereas the circuit- 16 is opened. The relay IR will thus co-operate with the slow-acting relays HR and GR so as to be alternately energized and cle-energized while sending out forward impulses over the circuit 11 and back impulses over the circuit 16. 'Ihis will cause a simultaneous setting of the group selector connected tothe junction line CL, and the control switch RE7 and this operation -will continue till the control switch reaches the position marked by the register switch RE3 ka circuit 18 beingV then closed through the relay ER. Owing thereto the sequence switch SOG@ is now moved forward for another step in the manner above described. The circuit 12 of the relay KR will then be broken for a moment causing the slow-acting relay LR to be operated by a current impulse over the circuit 19. Owing thereto the circuit 13 for the relays GR and IR will bel kept open for a period of time which is suHicient to allow the group selector to select a disengaged final selector or connector. When the circuit is then again closed, the'relays I-IR, GR and IR will send out another series of current impulses similarly as just described whereby the connector is set for the selection `of the tenth the control switch RE8k being then stepped forward till it reaches a position marked by the register switch REM in which position a circuit 2() is closed whereby the relay ER is again operated andthe sequence switch SOR2 is again set in the manner above described. By the action of the relays HR and LR the connector willthen at the same time be switched over for the selectingr of the units. 'Y Finally a third series of current impulses will follow whereby the connector is set on to the wanted subscribers contacts under the controlof the control switch RE'-which iscaused to stop in a position marked yby the register switch i In this position a circuit 21 is closed through the relay ER. The talking connection is then completed and the register disengages itself from the junction line BL and is restored to normal position in known manner.

. I claim:

l. In a telephone system comprising a plurality of intercommunicating telephone exdifferent k numeral fsystem'si," control i mecha# nisms at kone *ofl saidexchanges, vcircuits"underE 'the' control'offsaidmechani'snisfffor controlling thegexteiifsin I(if 'thetal'lfzing"l connection,l

meansr "for: settingjsa'idif 'control 'meclianismsf 1n accordance withthe subscribers numberk wanted and 1means associated with said con-y trol.: rrfe'chanism's (for 'yaryiiig saidl `4circuits', whenthe connection is'extended' to "another Qfliange, sov as toj7 thef "control mecha? ,for ,the "lmerlcal Systlifth other'l @Change-' l `v 2;, ''.telephond SystnfCompri.Sinei1P111"l ralityV` of A interccnimunicatijng t'elephoiieex# changes` v1 @selector-switches ofidifferent kinds an.' S erinpede 'eCcOrdCen/tl' Cluere'litv iunerelsyst" f nisms. @tone lof 'd exclliillgeis.,.circuits'under the 'control'iof'fs'aid mec-hanisms for controlling the extension .of the talking. connection, meansv for setting sald control mechanisms vin accordance with the vsubscribers number wanted, sets of contacts associated controljmeclal' 1 with said control'mechanisms and adapted tol Ycontrol said circuitsv for settingv the selectors 41n accordance with different numerical sys- A tems, and means Vunder the control of said control mechanisms for switching said setsV ofcontacts alternatively in and out of operation according as the connection is to be extended to a subscribers line of the same or .another exchange.

3. In a telephone system comprising a pluchanges having selector switchesof different li60 rality of intercommunicatmg telephone exkinds and lines-grouped inraccordance with different numericall systems, control mechanisms at lone of said exchanges, means for setting said control mechanisms in accordance with the subscribersnumber wanted, a

control impulse circuit forcontrolling the extension ofthe talking connection, a stop relay for controlling said impulse circuit, a`

circuit for said stop relay under the control of said control mechanisms, sets of contacts associated with said control mechanisms and particularly adapted for the different numerical systems of the exchanges, and means under the control ofsaidfcontrol mechanisms for shifting the circuit of said stop relay alternatively under the Vcontrol of the one or the other set of contacts according as the connection is to be extended to a subscribers line ofthe same' or another exchange.

4. In a telephone system comprisingv a plurality of intercommunicating telephone exchanges having selector switches of different kinds and lines grouped in accordance with different numerical systems, control mechanisms at one of said exchanges each control mechanism comprising a number of register switches to be set in accordance with the subscribers number wanted, a number of controLswitches adapted kto .control-V the setting ofthe selectors, sets of contacts on said register andcontrolswitches particularly adapted orthe different numerical systems of the exchanges, and electrical connections loe#y tween the contacts of said register and control Switches, a Control .impulse circuit for controlling they extension of the talking connection, a stoplrelay forcontrolling saidV im-Y pulse circuit, a circuit for said stop relay un# dert the control of said register and con-trol switches, and means under the control of said register switches for 'Varying the electrical connections between theregister and vcontrol switches vso as to shift the circuit oflsaidstop relay alternatively under the cQntrolo one orlthe other set of contacts according as the connectionis to beextended to a subscribers line of the` same or another exchange.`

. In testimony vwhereof I aiix my signature.

. ROMAN TRECHCINSKI.

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